Many users have complained about a possible Windows Phone 7 data leak or high data usage. For those still dealing with this issue, the answer is out! Yahoo is to blame, specifically a non-standard IMAP implementation. IMAP is a protocol used to synchronize email between your provider’s servers and your device or email client.A fix is in the works at Yahoo, but has not been released yet. Your best solution at this point is to limit your phone’s access to Yahoo mail. Adjust the Windows Phone 7 email app to check for new mail less frequently or even manually.